noun.
I will top up the antifreeze before we leave.
Notice the definite article 'the' comes before 'antifreeze', this is a good clue to what part of speech antifreeze is.
Usually we have: article + noun. eg the dog, the sun
Or we have: article + adjective + noun. eg the black dog, the hot sun.
Antifreeze is not made out of any part of the pig. Antifreeze is a combination of chemicals used to keep your engine's liquids from freezing. It works by lowering the freezing point of liquids.
The part of speech for this particular word is a noun.
part of speech
The part of speech for "answer" is a noun.
what part of speech is beneath
adverb
To obtain a solution that is twenty percent antifreeze, you would add 4 parts water to 1 part antifreeze. This means that for every 1 part of antifreeze, you would add 4 parts of water. This would result in a total of 5 parts of solution, with 1 part being antifreeze and 4 parts being water, achieving a solution that is twenty percent antifreeze.
The part of speech for "explicit" is an adjective.
The part of speech for "lecturer" is a noun.
The part of speech for "rapid" is an adjective.
The part of speech of "came" is a verb.
The part of speech for "breezy" is an adjective.